docs: def init_app(self, app):
          """
          Initializes the extension for the provided Flask application.
  
          Args:
              app (flask.Flask). the Flask application for which to initialize the extension.
          """
          self._key = app.config.get(CONF_KEY) or getenv(CONF_KEY)
  
          if not self._key:
              return
  
          self._endpoint_uri = app.config.get(CONF_ENDPOINT_URI)
          sender = AsynchronousSender(self._endpoint_uri)
  
          queue = AsynchronousQueue(sender)
          self._channel = TelemetryChannel(None, queue)
  
          self._init_request_logging(app)
          self._init_trace_logging(app)
          self._init_exception_logging(app)